Why am I unable to install Yosemite on a MacBook 13 in retina (late 2013)?

I find this as a huge issue because my Mac is just 3 months old and it cannot upgrade to Yosemite. I tried upgrading from maverick and the login screen is black once the upgrade is done and no way to login except for a loading circle in the bottom centre of the screen. I tried installing it on a new partition, restored my applications through time machine and restarted my Mac only to get another black screen with the same loading circle. So when they do release the final version, I'm scared that this problem will not be cleared and I have to reinstall my Mac to its brand-new state to enjoy Yosemite? This is not the first PB but the last one that came out. I tried it on the first PB and the same issue existed then and exist now. Any solution to this?

Just tried booting in safe mode and the same problem propped out. There's a high possibility this can repeat again and I'm just disappointed that a new machine gives me this much problems in terms of installing a beta. I know beta can be buggy but not the startup screen itself lol. And this is the fourth beta.